Inductance device for wireless electrical signaling.



G. 0. LORENZ.

INDUGTANGE DEVICE FOR WIRELESS ELECTRICAL SIGNALING. APPLICATION FILEDNOV. 7, 1910.

1,133,441 Patented Mar. 30, 1915.

I 2 SHEET$SHEET l.

C. O. LORENZ.

INDUCTANCE DEVICE FOR WIRELESS ELECTRICAL SIGNALING.

APPLICATION FILED NOV. '7, 1910.

Patented Mar: 30, 1915.

2 SHEETS-SHEET 2.

Ym/en to!" Charley 0 Lorenz.

reduced to a minimum.

UNITED STATES PATENT OFFICE.

.CHARLEY 0. LORENZ, OF PORT ARTHUR, ,TEXAB.

INDUCTANQE DEVICE WIRELESS ELECTRICAL SIGNALING.

Specification of Letters Patent.

Patented Mar. 30, 1915.

Application filed November 7, 1910. Serial No. 591,130.

To all whom it may concern.

Be it known that I, CHARLEY O. Lorenz, a'citizen of the United States,and resident of- Port Arthur, in the county of Jefferson and State ofTexas, have invented certain new and useful Improvements in InductanceDevices for Wireless Electrical Signaling, of which the following is aspecification.

' This invention relates to the art of receiving intelligible signalstransmitted by means of electromagnetic waves, without the useof wiresor other material means to guide the waves to their destination.

The main or general object of the present invention is to provide meanswhich may receive messages transmitted in the form of dots, dashes orspoken words through space from one given station to any desired placewith greater accuracy and precision than has heretofore been possible.

The above object is attained by the emloyment of novel means whichpermits the lnstrument to be adjusted or regulated in such a manner thatthe varying atmospheric conditions will have no detrimental effect onthe instrument and which materially increases the selectivity of theinstrument.

One of the great objections to the art of wireless telegrap'hyheretofore has been the inability of the various receiving stations toso regulate their instruments that static interference as well as theeffect of adjacent high powered lines, are lights, etc., will beeliminated.

In the present invention I have p'rovided an improved tuningtransformer, whereby interference from collateral sources will beBroadly speaking my improved tuning transformer comprises co-axiallyrelated primary and secondary coils tapered in the direction of theircommon axis with the combined advantages of permitting modification tothe air gap between the coils with a minimum reductionof their induc--tive relationship and at the same time per mitting the cutting in orout, of different sizes of convolutions or individual coils andeflecting very much closer tuning.

To more clearly illustrate, and without intending to limit my invention,a pair of primary and secondary coils may/ he employed, each of saidcoils being cond-shaped or tapered, the secondary coils telescoping theprimary coils. Thus the primary coils may be 1. inches in diameter atone en and companying 4- inches in diameter at the opposite end and ofany suitable length. It will of course be understood that the diametersof the coils may vary, depending'upon the character of instrument,either portable or stationary, and that the above dimensions are simplygiven so that a given comparison of the effectiveness of my tuningtransformer may be made with the ordinary tuners employing cylindricalcoils of a single unvary-ing diameter. In combination with theseconeshaped coils I employ novel sliding contacts, more specificallydescribed hereinafter, and which may be moved over said coils to varythe induction. When the contact is moved over one turn of the winding onthe lower end of the primary coil, the induction will be increased onlya fraction, butif the contact is made at the large end of the coil theinduction is increased about four times as much as at the small end,thus increasing the tuning of the instrument to a marked degree.

A still further object of the invention comprises means in combinationwith the primary and secondary coil whereby one of the secondary coilsmay be cut out andthus rendered inoperative, under which condition therespective primary coil will act as a balance for the aerial circuit.

Further objects and advantages of the present invention will appear fromthe following descri tion with reference to the acrawings, whereinFigure 1 is a diagrammatic View of my invention. Fig. 2 is a sectionalview through the casing showing the relative position of one of theprimary and secondary coils.

ters a and 6 indicate two cone-shaped pricoils may be cut out. Thesecoils comprise a core of non-inductive material such as mica, fiber orsuitable composition 5, while the winding may be of any suitable wire.Each ofthe primary coils have two sliding contacts 6, 7, 8 and 9respectively, which are movable over the windings of the coil andadapted to vary the number of active turns thereof. The sliding contactseach comprise a holder 10, longitudinally apertured as at 11 to permitthe mounting of a holder on each of the rods 12 and 13.

The top section 14 of the holder is constructed of any non-conductingmaterial such as hard rubber, and is provided with depending sideflanges 15, secured by suitable means, (such as is shown in dotted linesin Fig. 4) to a metallic base plate 16.

On the upper face of the. base plate 16 a small countersink 17 is formedwherein a leaf spring contact plate 18 is positioned. This contact plateis flexed outwardly from the countersink, and thus projects into theaperture 11, so. that it will insure a perfect contact at all ztimeswith the rod over which the sliding contact travels. A tubular finger,or projection 19 extends downwardly from the base plate, the borethereof communicating with the countersink and adapt ed to receivetherein the annular lug 20 car ried by the spring contact 18.

Fitted within the lower end of the tubular member 19, and extendingtherefrom, is a contact point 21 which is electrically connected to thecontact plate 18 and at the same time maintained in its contactualposition by means of the coil spring 22. This contact point 21 movesover the windings of the primary coils, the insulation on the said coilsbeing removed throughout the path of the contacts, so that the point 21contacts directly with the bare wire of the coils.

Referring to Figs. 2 and 3, it will be seen that a pair of parallel rods12 and 13 are mounted adjacent to and substantially parallel with eachof the primary coils. The rods 12 are. electrically connected to theaerial circuit while the rods 13 are each electrically connectedrto theground. In

. order that perfect conduction may be assured between the coils androds 12 and 13, one end of a flexible wire is connected to the metallicbase plate 16 of the holder, and the other is secured directly to thesaid rods. The two secondary coils c and (Z are adapted to telescope theprimary coils a and I) respectively and, as shown in Figs. 2 and 3,

are mounted upon rods 24;; Inasmuch as theactive turns of coils orwindings a and b are regulated by the adjustment of the slidingcontacts, it is desirable to so adjust the secondarycoils, that theactive turns thereof will be directly under the active turns of theprimary coils. This is accomplished by providing adjusting bars 25, oneof which is secured to each secondary coil. These bars are slidablyjournaled in the casing 2 and are provided with a scale (not shown)whereby the adjustment of the coils may be accurately determined. Thesecondary coil 0 is much smaller than coil a, and is Wound with a singlelayer ofv wire, being provided with two leading out wires 26 and 2-7.The secondary coil d is wound, in the present instance, in sixteensections, each section having a leading out wire secured thereto whichis connected with a variable switch 6. In securing the leading out wiresto the, winding of the coil d an incision is made in the core, and aportion of the winding projected therethrough and securely soldered tothe leading out wire.

. The constructionof the Variable switch a is illustrated in detail inFig. 5, and comprises a base 28 having a series of electrical contactpoints 29 positioned thereon, each of I the points being connected toone of the wires leading from the sectional secondary coil d. A pair oflevers 30 and 31 pivoted on a common shaft 32 are insulated from eachother by the bushings 35 and gaskets 36 and are electrically connectedto the wires 33 and 34. respectively, said levers being adapted to beoscillated over the contact buttons whereby any of the sections on thecoil (Z may be cut out or in as desired. By means of this arrangementthe detector and aerial circuit may. be brought into perfect balance. Bycombining the switch mechanism with a conical shaped secondary coil, itwill be appreciated that an exceedingly fine tuning will result,inasmuch as the sections of the secondary coil dent in or out may be soselected as to secure a balance of the most minute degree, between theaerial and de tector circuits. 1

The reference characters 7 and 9 indicate a pair of pole changingswitches.

Fig. 1, the detector, telephone-receivers and both secondary coils :areconnected in .elecbalance for the aerial wires.

- "In-orderto increase the efliciency of the instrument, andto permitextremely close tuning, two variable condensers h are employed, butforordinary work it has been found that they are not absolutely necessary pIn the position shown in the diagrammatic .view,

When the instrument is to be used for receiving messages it is necessaryto protect the detector, fixed condenserk, and telephone. receivers,from burning out by the high frequency currents incident to the sendingor transmitting of messages.

It should be understood that while Lhave specifically described oneembodiment of my invention, it will be obvious that many changes may bemade therein without departing from the spirit and substance of myinvention. Among other changes or immaterial variations, a'thirdvariable condenser may be shunted across the minerals of the detectorleading to the two binding posts at the back of the case.

Although forming no part of the present invention a detector has beenshown diagrammatically in Fig. 1. It is provided with a suitable lever59, adapted to engage a pair of electric contact buttons, one of whichis connected with the switch lever 30 through wire 34, and the othercontact but-' ton is connected with the telephone receivers through wire.62.

What is claimed is 1. In a system of high frequency electricalsignaling, an induction device having a primary coil tapering indiameter gradually from one end to the other, and a contact device foreach end of said coil adapted to connect the windings of'said coil incircuit; said contact devices being independently movable forselectively cutting in and out convolutions of varying length.

2. In a system of high frequency electrical signaling, an inductiondevice comprising primary and secondary coils, each having'convolutionsat one end smaller than' those at the other end, means for-axiallyadjusting one of said coils relatively to the other, and independentlymovable contact devices having electrical connections which adapt themto cut in and out of circuit, respectively, large and small convolutionsof the primary coil.

3. In a wireless telegraph system, a set of conical primary coils, a setof conical secondary coils telescopically arranged relative to theprimary coils, and means for adjust-.

ing the relative positions of said coils.

i. A receiver for electro-magnetic waves comprising cone-shaped primaryand secondary coils, means for adjusting the sec ondary coils relativeto the primary coils and means for varying the inductive turns of one ofthe secondary coils. v

5. A receiver for electro-magnetic waves, comprising a conical primarycoil, a conical secondary coil wound in sections, and telescoping saidprimary coil, and a variable switch cooperating with the secondary coil,whereby the number of active sections may be varied.

6. A receiver for electro-magnetic waves comprising a pair of primarycoils, each of said coils varying in diameter, a pair of secondary coilstelescopically arranged relative to the primary coils, one of said coilsbeing wound in sections, a variable switch electrically connected toeach of said sections, and means forvarying the number of activesections in the secondary coil comprising a pair of levers, contactpoints for said levers connected to the sections of the secondary coil,whereby any of said sections may be cut in or out. p

7. In a system for wireless telegraphy, the

- combination with primary coils, electrically connected rods positionedparallel to said coils, movable contact devices mounted thereon, eachcomprising'a holder having an aperture to receive the rods, a dependingprojection carried by said holder and provided with a bore communicatingwith the above named aperture, contacts positioned within each end ofsaid bore and means adapted to electrical1y, connect said concating withthe aperture, contacts positioned in each end of said bore and springmeans interposed between said contacts, adapted to electrically connectsaid contacts and maintain them in contactual position. if

The foregoing specification signed at Houston, Texas, this 2nd day ofNovember, 1910.

. CHARLEY O. LORENZ. In presence of I. J.. Ross,

